That's why I said karmic justice.

I think it's a close book. The book details the decision process from both sides. Japan's plans to continue the war. The way the high command coped with the first atomic bomb, etc. It does not sway you into thinking any side was justified, but it expands one's perspective to help you understand the other's side.

No matter how much you don't like it, the use of that weapon was neither revenge or murder.

I personally don't see the world in terms of revenge and murder, so it's hard for me to understand how such specifically personal behaviors factor into the first Atomic attack.